exec() - system() problem

hi all..
i can't get any screen outputs from system commands with using exec() or system() or any way..
i copyied prepared codes to fix the problem..didn't change any thing..

there is no error message..do you have any idea?

 

you can't call all and any command with exec, please post the code youre trying to run.

 

<?
$d= system(“ls”);
echo $d;
?>

Code (markup):

---------->like this.

<?php

echo exec('whoami');

?> 

Code (markup):

-------------> or this..

i tried several ways.neither gives output..

 

<?php
echo '<pre>';

// Outputs all the result of shellcommand "ls", and returns
// the last output line into $last_line. Stores the return value
// of the shell command in $retval.
$last_line = system('ls', $retval);

// Printing additional info
echo '
</pre>
<hr />Last line of the output: ' . $last_line . '
<hr />Return value: ' . $retval;
?>

-------------------------------------------
exec
(PHP 3, PHP 4, PHP 5)

exec -- Execute an external program
Description
string exec ( string command [, array &output [, int &return_var]] )


exec() executes the given command.

Parameters


command
The command that will be executed.

output
If the output argument is present, then the specified array will be filled with every line of output from the command. Trailing whitespace, such as \n, is not included in this array. Note that if the array already contains some elements, exec() will append to the end of the array. If you do not want the function to append elements, call unset() on the array before passing it to exec().

return_var
If the return_var argument is present along with the output argument, then the return status of the executed command will be written to this variable.


Return Values
The last line from the result of the command. If you need to execute a command and have all the data from the command passed directly back without any interference, use the passthru() function.

To get the output of the executed command, be sure to set and use the output parameter.

Examples
Example 1. An exec() example

<?php
// outputs the username that owns the running php/httpd process
// (on a system with the "whoami" executable in the path)
echo exec('whoami');
?>

 

thank you .but the examples didn't work to..

i think i have a problem with php..but i don't know how to find and fix.

 

Are you running this on your machine / a machine under your control or on a remotely hosted machine?

If the latter, they may very well have stopped PHP from doing it in which case you probably can't override it.

 

i'm using vmware .

my machine is windows.there is slakcware on vmware.it has lamp.the other php pages (which don't have system command ) works good.